A Gibbs energy balance model for the isothermal ferrite-to-austenite transformation

Dong An; Shiyan Pan; Qingqiang Ren; Qian Li; Bruce W. Krakauer; Mingfang Zhu

doi:10.1016/j.scriptamat.2019.11.027

A Gibbs energy balance model for the isothermal ferrite-to-austenite transformation

Dong An
, Shiyan Pan
, Qingqiang Ren
, Qian Li
, Bruce W. Krakauer
, Mingfang Zhu

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

A Gibbs energy balance (GEB) model for the ferrite (α)-to-austenite (γ) transformation is developed based on the mixed-mode concept and applied to study the isothermal α→γ transformation at the intercritical temperature of 760 °C in Fe-C-Mn and Fe-C-Mn-Si alloys. Both transformation kinetics and stable γ-volume fraction are found to decrease due to the Gibbs energy dissipation caused by the Mn diffusion inside the interface. The decreased interface mobility leads to a slower transformation rate, but has a negligible effect on the stable γ-volume fraction. The transformation kinetics predicted by the GEB model compares reasonably well with the dilatometric measurement.

Original language	English
Pages (from-to)	207-210
Number of pages	4
Journal	Scripta Materialia
Volume	178
DOIs	https://doi.org/10.1016/j.scriptamat.2019.11.027
State	Published - Mar 15 2020
Externally published	Yes

Funding

The authors are grateful to Prof. Hao Chen at Tsinghua University for helpful discussions on the GEB concept. This work was financially supported by A. O. Smith Corporation, USA, NSFC (Grant nos. 51371051 and 51501091).

Keywords

Gibbs energy balance
Kinetics
Modeling
Phase transformations
Steels

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10.1016/j.scriptamat.2019.11.027

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title = "A Gibbs energy balance model for the isothermal ferrite-to-austenite transformation",

abstract = "A Gibbs energy balance (GEB) model for the ferrite (α)-to-austenite (γ) transformation is developed based on the mixed-mode concept and applied to study the isothermal α→γ transformation at the intercritical temperature of 760 °C in Fe-C-Mn and Fe-C-Mn-Si alloys. Both transformation kinetics and stable γ-volume fraction are found to decrease due to the Gibbs energy dissipation caused by the Mn diffusion inside the interface. The decreased interface mobility leads to a slower transformation rate, but has a negligible effect on the stable γ-volume fraction. The transformation kinetics predicted by the GEB model compares reasonably well with the dilatometric measurement.",

keywords = "Gibbs energy balance, Kinetics, Modeling, Phase transformations, Steels",

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AU - An, Dong

AU - Pan, Shiyan

AU - Ren, Qingqiang

AU - Li, Qian

AU - Krakauer, Bruce W.

AU - Zhu, Mingfang

PY - 2020/3/15

Y1 - 2020/3/15

N2 - A Gibbs energy balance (GEB) model for the ferrite (α)-to-austenite (γ) transformation is developed based on the mixed-mode concept and applied to study the isothermal α→γ transformation at the intercritical temperature of 760 °C in Fe-C-Mn and Fe-C-Mn-Si alloys. Both transformation kinetics and stable γ-volume fraction are found to decrease due to the Gibbs energy dissipation caused by the Mn diffusion inside the interface. The decreased interface mobility leads to a slower transformation rate, but has a negligible effect on the stable γ-volume fraction. The transformation kinetics predicted by the GEB model compares reasonably well with the dilatometric measurement.

AB - A Gibbs energy balance (GEB) model for the ferrite (α)-to-austenite (γ) transformation is developed based on the mixed-mode concept and applied to study the isothermal α→γ transformation at the intercritical temperature of 760 °C in Fe-C-Mn and Fe-C-Mn-Si alloys. Both transformation kinetics and stable γ-volume fraction are found to decrease due to the Gibbs energy dissipation caused by the Mn diffusion inside the interface. The decreased interface mobility leads to a slower transformation rate, but has a negligible effect on the stable γ-volume fraction. The transformation kinetics predicted by the GEB model compares reasonably well with the dilatometric measurement.

KW - Gibbs energy balance

KW - Kinetics

KW - Modeling

KW - Phase transformations

KW - Steels

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SP - 207

EP - 210

JO - Scripta Materialia

JF - Scripta Materialia

ER -

A Gibbs energy balance model for the isothermal ferrite-to-austenite transformation

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